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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Veins can give you a blue tint. If your eye areas look particularly blue, it could simply be your blood vessels. Blue veins under your eyes look dark, too, so it makes the eyelids and under eyes appear to have dark circles, but really it's just the veins under the skin, explains Dr. Katz.